Mechanical movement for doorbolts and the like



Dec. 8, 1925. 1,564,729

' A. VON SCHRENK MECHANICAL MOVEMENT FOR DOORBOLTS AND THE LIKE FiledOct. 25, 1922 2 Sheets-Sheet 1 ljgil. E92.

2:5 ,25 o o; 0 cl .28 a o o o 2/ gvweuloz Mama:- HRWULD VUNE'UHRENK Dec.8, 1925. 1,564,729 .A. VON SCHRENK MECHANICAL MOVEMENT FOR DOORBOLTS ANDTHE LIKE Filed Oct. 25, 1922 '2 Sheets-Sheet 2 snow/lot Patented Dec. 8,1925.

UNITED S A ES PATENr OFFICE; j-

ARNOLD VON sormnivx, 0F TUoKAnon, new YORK.

MECHANICAL MOVEMENT FORYDOORBOLTS QANDITHE LIKE.

Application filed 0ctober25, 1922. -Serial No. 596,750.

1 exert-ion of a relatively small fraction of the power in order tocontrol the applicationof the potential energy. It involves the furtherdevelopment of the invention ofthe principle set forth in my Patent No.1,291,664 granted January 14, 1919, and has for its particular objectthe provision ofa mechanical movement of simple construction,durability, ease of operation and reliability, and in certain respectsfeatures of construction for the special application of such mechanicalmovement.

This application providesmore particularly for theme of the invention inor on structures such as refrigerator doors. In this and similarstructures it is desired to apply considerable force to actuate certainintermittent operating devices as, for -example, the locks on arefrigerator door which must be tightly closed and therefore requires apredetermined and considerable pressure. While dilferent operators mayexert a varying pressure or fail to apply sulficient force for theproper actuation of the structure, this invention provides formechanical parts to exert the predetermined pressure at all times withonly a slight and relatively small power application on the part of theoperator. Thus the force closing the doors, or similar operation, doesnot depend upon any varyingeffort on the part of different operators orthe same operator, and still more, a single movement well within thelimits of any operators power results in the same power application fromthe stored potential energy member with uniformity and at all times.

In the case of refrigerator doors, a plurality of bolts at differentparts of the periphery of the door can all be actuated by a single powerapplication from a single unit of predetermined potential power, and thecontrol of. the actuation may be effected by a single lever requiringbut a small frac-' tion ofeifort compared with the power actuating thebolt or bolts.

In the accompanying drawings forming-a part hereof, P i i a I Fig. 1 isa front elevation of a'refrigerator door showing the mechanical movementto operate a'single bolt, the cover of the mecha nism being removed.

Fig. 2 is a fragmentary view, .front elevation, of a door showing themechanism controlling two bolts with a single operating lever. V p e F1g. 3 1s a fragmentary view'showing the mechanical movement on a largescale with the casing removed, shown in detail.

Fig. 4 is a cross-section of the'latch or bolt and bolt socket of Fig.3, on a larger scale. 1 3

Referring to the figures, 1.is a floating lever which operates on amovable fulcrum 3, shaped like a roller, the position of which can bevaried byshifting the rod 4, to which it is attached; A spring 2isconnected to one end of the floating lever 1. The other end of spring2*is connected to a second lever 5, which turns on a fixed pin 6. Spring2 is attachedto the two levers 1 and 5 in such a way as to be undercompression in the arrangement of elements 'herein shown. But withanother arrangement it might be under tension. Theends'of levers 1 and 5opposite to spring 2 are connected together by a link 7. Link 7 moves ina guide 15, and its end is formed into a door catch 16 having a taperend which engages with a recessed fitting 17 rigidly secured to thedoorjamb 20. An operating handle 10 carries a toothed sector 11, whichmeshes with a rack 12 attached to the fulcrumcarrying rod 4;. The rod 4moves on rollers 13, 13, and is held in place by fixed guides 14, 14.The floating lever l is prevented from displacement by a link 8, whichturns on a fixed pin 9.

As the forces exerted at the opposite ends of spring 2v are of equalvalue, at all times,

it is obvious that this system of levers and links will be inequilibrium if the movable fulcrum 3 is moved to a position such thatthe arms of floating lever l will have the same ratio as the arms oflever 5. This equilibrium position of the fulcrum is denoted by the linea-a. If the fulcrum 3 drives rack 12 and rod 4 in a downward direction,thus moving fulcrum 3 below the. equilibrium line aa, and causing thepower'of: the sprin'g 2 to' be exerted in such a manner as to move link7 to the right. This will shove the taper end of catch 16 into therecess of fitting 17 thuspressin'g the door 19 tightly against the doorjamb 20.

The entire mechanical movement is assembled on a plate 18, which isbolted to the door 19. The shaft of, handle 10 and sector 11 may extendthrough the door, so that the device may be operated from either sideofthe door.v

A spring 21 may be arranged to cooperate with the rod 4:.to keeplthefulcrum 3 normally below the equilibrium line a-a, and thus, hold thecatch16 in the closed position unless the, handle 10 israised. In thisway the door andfastener may be made self closing.

If. desired,the taper end 16 may be replaced by a roller 26, cooperatingwith a suitable fitting 27 attached to the door. jamb, as shown in Fig.2. In the case of large and heavy doors for which it is desired to havemore than. one fastening, the link 8 may be replaced by a bell crank,22, which operates in connectionwith a rod 23,, bell crank 24 and rod28, Working in the guide 25, to push the catch 26 into the fitting 27,as shownin Fig. 2. The number of, these fastenings may be multiplied asmuch as is desirable.

In the application ofniy invention, other forms of' springs maybe usedand other sources of power maybeemployed, such, for instance, ascompressed air, hydraulicpower, steam, magnetism, and so on, and otherarrangements of the various elements,,ma;y;be made, within the, scope ofmy invention. I do not confine myself tothe exact constructions hereinshown and described, but what I claim and desire to secure by LettersPatent is :v

1. A mechanical movement for control of intermittent operating mechanismcomprising'a reciprocating member and a supportmg gulde therefor, apotential energy element connected therewith and interveningleversincluding a floating lever and a shiftbolts and the, likeincluding apower-delivering element and means for applying the en? ergythereof to press said bolt, said means including ajfloating lever and ashiftable fulcrum therefor and manually operated means to control theapplication of said energy.

3. A mechanical device for reciprocating a door bolt or similar device,comprising a mechanical. potential power element, a system of balancelevers associated therewith including one lever and an associatedshiftable fulcrum, means: for shifting said fulcrum in one direction andmeans for automatically returning said fulcrum in the opposite directionto insert the bolt or like member.

4:. A mechanical, movement for operating adoor-closing device and thelike, including a potential energy element, a lever with a fixedfulcrum, a floating, lever, a movable fulcrum, and means for shiftingsaid. movable fulcrum.

5. A mechanical device for operating door bolts and the like,includingapotential source of power, a lever with a fixed fulcrum, a floatinglever, a movable fulcrum for said. floating'lever, means for shiftingsaid movable fulcrum, andgconnectinglinkee- In testimony whereof, I.have signed my name to; this application, this 30th day. of March, 1922.

ARNOLD VON SGHRENKQ.

